Shift mechanism for type-writers.



G. W. DAVIS. SHIFT MECHANISM FOR TYPE WRITERS. APPLICATION FILED JUNE 23, 1911. 1,054,396, Patented Feb.25,1913.

4 SHEETS-BHBET 1.

G. W. DAVIS. SHIFT MEGHANISM PoR TYPE WRITERS.

APPLICATION FILED JUNE 23.1911.

Patented Feb. 25,1913.

4 SHEETS-SHEET 2.

G. W. DAVIS. SHIFT MEOHANISM POR TYPE WRITERS.

APPLICATION FILED JUNE 23, 1911.

1,054,396. e Peeeeeed Feb. 25, 1913'.

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fg iff@ G. W. DAVIS.

SHIFT MBGHANISM PoR TYPE WRITERS.

APPLICATION FILED JUNEZB. 1911.

Patented Fsb. 25, 1913.

4 SHEETS-SHEET 4.

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aulo-L alter@ V end of l To all whom t may concern.'

GEORGE WILLIAM DAVIS, F WES'IMOUNT, QUEBEC, CANADA.

SHIFT MECHANISM FOR TYPE-WRITERS.

, Specification of Letters Patent.

Patented Feb. 25, 1913.

Original application led January 3, 1907, Serial No. 350,637. Divided and this application tiled June 23, 1911.' Serial No. 634,953.

'Be it known that I, GEORGE WILLIAM DAVIS, a subject 'of the King of Great Britain, of Westmount, in the district of Montreal, Province of Qu bec, Canada, have in-- vented certain new nd useful Improvements in Shift Mechanism for Type-Writers and I dohereby declare that the following is a'full, clear, and exact description thereof.

The object of this invention is tolprovide novel shift. devices, V. lock therefor and a particular spring connection between certain of the parts wherebythe shift keys are j returned to their normal positions and yieldy15.

ingly held there, y

A further object. of the inventionis to 'provide amovel arrangement of the shift shafts toacilitate' assemblin and'dismem- Bering of the operating mec anlsm of the machine.

` .This invention is adapted to be applied .lOlsa vto that type of writing machine illustratedl -in patent 'application Serial No. 350,637, filed Januaryv, 1907, of which this forms a divisional part. For full comprehension, however of lmy invention referenceV must b -lhad to the 'accompanying drawings forming a' art o flhis specification in which like re erence .characters indicate the same parts and wherein ,Figure 1 1s V a plan View 4of a typewriting machine with my improved shift mechanism I'applied thereto; Fig. 2 is a longitudlnal .wertical section thereof; Fig. 3 illustrates the shift mechanism in plan view and re- V"moved from the machine; Fig. 4 is a side .,atively connecting the same to the elevation of the two shift keys and shift lock key with a portion' of the means opervibratory carriage; Fig. 5 1s a detail view of the rear one of the shafts of thet'shift mechanism; Figs, 7 and 8 are perspective views of portions of the shift mechanism; Fig. 9 is a perspective 'view of the shift lock'bar which is mounted slidably upon the underside of the' key-board cover plate; and Fig.

planes,

perspective view of the frames of the main and vibratory carriages.

vThe main frame of the `machine presents portions b and c in diHer-ent horizontal .the lowermost. I) being at the rear andthe upper c at thevmiddle of the machine.

" The carriage consists of the main car- 'e ringe frame and a` vibratory carriage frame carried thereby; a platen roll 2 being mounted on the vibratory carriage; a portion ofV the tabuiator mechanism and other parts 1n addltion to the vibratory carriage are 'mounted on the main carriage frame but .and constituting a rail in which the trundle of the carriage runs, the ad-` roll f (Fig. 2) Avantage of this arrangement (rearwardly facing) of the channel bar e being that particles dro ping from the ink ribbon, as it wears, will not lodge therein and clog the trundle roll. tain the linear area (or inl other words the area in which the line of writin is movedl to use small type, capitals or Egures and other characters) in the same vertical plane the platen roll 2 which as above mention is mounted .in the Q it has been mounted heretofore in lits carrier) side as' at z' and projected through vertical slots j in theend plates k and Z of the main carriage framed'` The usual bar m,.ca,rx;y.in the -ratchets a, to one of whiclnis connected the spring o for 'yieldingly maintaining the platen carrier carried by the carriage longitudinally thereof, and according to this `invention has a pair of lever arms p fixed rigidly at one end thereon as atg and havingtheir oppo-' s1teA ends pivotally connected lower parts of the end frame vibratory carriage. This vibratory carriage is depressed to two positions below its normal .position (where it receives impressions Jas at fr' to the upper end of thervibra- Y tory carriage frame (in the same manner` has its trunnions It attened at eachm its uppermost position, isl

plates d of the In order to constantly main from the small letters) in order to shift the platen to a position to either receive ii'npressions from the capital letters or figures, by a pair of shift keys s and {(Figs. 1, 3 and 4) pivoted u on a rocker shaft u (known as the shift-Shadi) having an arm c rigidly mounted thereon through a hub' w and another arm a: mountedrigidly upon the shaft u is,

connected by a universal -joint y to anarm z upon a second or counter rocker-shaft `3 which has a transverse double lever mount` ed rigidly thereon and carrying upon the fend ofpne erin 4 the trundle roll f adapted 110 to Iengage in ,the channel. bar While the end of its other arm 5 is adapted to bear upon an adjustable stop carried by the main frame and consisting of a screw 6.' The arm 'u has a lug 7 extending beneath the key s and a second lug 8 projecting beneath the key t while a lock bolt 9 constituting a portion of the shift key lock is `carried by the lug 8. This shift key lock consists of a bar 1(1(Fi s. 3,4 and9) formed with a pairl of keyl e theretdat one end a retractile spring 12 fastened to a lug 13 struck down from the cover plate 13a While its opposite end is offset as at 15. and notched as at 16 to engage the lockbolt 9 of the lever arm fu. This lock-bolt has a pair and a diminished head 20 and it is .threaded through the lateral projection 8 of lever o down, vwhich and has a jam nut 21 thereon While its lower end is slotted as at 22 to receive ascrew driver by which itis adjusted foi1 initial fitting,v thev lock being held slidably'l upon the underside of the cover plate by a pair of studs 23.

An 'angular leve-r 2,4 is fulcrumed upon a screw-stud 25 threaded into a tappedl perforation in the frame ,of the machine such lever pro'ecting through registering slots-26 and 2 igs. 3 and 9) in the cover plate 13 and in lthe lock. When Writin capitals `the 'shift .l key s is depressed and i considerable -lever t is depressed andthe lock key 24 moved. The bar 10 Will then engage the diminished head 20 and rest upon the shoulder 18. Upon again touching the key held depressed, the lock will be released and re# turned to its normal' position by tliespling l12. To cause the depression of the key s to lower the vibratory carriage one-half the full' extent (to receive impressions from the capital letters) a stop is usually provided,` the construction and operation ofl which is a i feature of this invention. To this end a bar 28 (Figs. 1, 3 and 6) is pivoted at one end as at 29 to the main frame and has its free end bent at right angles to its main length and provided with. a short rigid standard 30 While an adjustable abutment in. the form of ascrew 31 is carried by the frame beneath such bent end, the said bent end being normally. located in a posit-ionivith the standard 30 beneath that end of thev double lever `Which carries lthe trundle'rol-l. This bar 28 is operatively connected 'to the key t by.

`means of a depending arm 32v (Fig. et) upon such keydt and a rigid link 33 pivotally conslots 11 and having connectedof lshoulders 18 and 19 formed with .semble these parts'of the nested at one end to this arin32 and at its" other end to the bar 28 near its fulcruin point. A spring 34 (Figfl 3) connects the' bar 28 to the fra' of the machineA and a spring 35 ofllessrstrength than the carriage balancing spring 0` c0nnects an extension 36 upon the levers to a hole 37 in the lever arm yv. The spring 34 returns the bar 28 and, through rod 33, the normal position; thespring oithrough the intermediate mechanism, returns thel lever arm c and With it lever t to their normalp sitions; and as the spring 35 has a tendency to draw the extension 36 of lever s toward the arm 'u it will constantly hold such lever s in its normal (raised) position yand the tension of thisv spring 35 1s sufficient to retain the lever's in its raised position even when the arm o is depressed by-lever t. The depression of key t will lovvei' the vibratory carriage and simultaneously displace the stop constituted by the standard 30 and al- 10Wv the said vibratoiy carriage' to be floivered to its full limitythe key s not beingl operatively vconnected to the placethesame and its downward movement is consequently limited thereby.

In order to facilitate the assembling of I themembers of the shift mechanismthe tabf ulator shaft 50 is made readily removable and one end thereof is utilized as a partial .support for the said mechanism and .to retain the same movably in place'. To this end the tabulator or shaft'50`is made of sufficient length t'o project through bearing 51 'an exstop does not dis' tent slightly greater than thelength of the bearing 52 and such projecting a tenen 53a While the adjacent end of the shift shaft vu is bored axially .to receive suoli tenen. The counter rocker end. isv

shaft 3 (which receives'l its oscillator;v motion from the shift shaft it) is adapted to be readily setl in place with the ai'm and dow bie lever 4 revioiisly set forth thereon, by mounting di# end thereof, toward the carriage, in a bushing 54 mounted in turn in a bearing 55 in the mainframe While the opposite end thereof projects a short. distance through. the bearing 5G. The first inentio-ned end of this countershaft 3 is formed with a circumferential groove. 3. To lasshift.. operating mechanism' the shaft 50 is pushed from Y right to left through its bearings 'untilv the tenon thereon. is located within the bean ing 51 there being sufficient space for shaft u to be .received 'between thebearings 51 and 52. Such shaft lu is then pushed into its bearings 52 until the hub 1 0 stops it, and the shaft 50 is next moved until the tenon enters the hole in shaft u thus supporting the la'tter rotatably in place. The screw 5T being tightened secures the shaft 50 againstdisplacement. :The end of shaft 3 (that end toward the carriage) is then entered from below and diagonally into the bearing 55 and pushed through the same until the o posite endcai be inserted into bearing 56 w' ich is then done and it is pushed through the latter until the groove 3a comes into line with a tenoned retaining screw 58. The bushing.

is then put in place with a hole 59 therein also in line with the tenoned screw which is'then tightened, thus completing the assembling of the shift operating mechanism. Although I have illustrated and described the carriage construction, and carriage support, I do not herein claim the same as they form the subject matter of a separate application, filed vDec. is, 1911, serial No.

`What I claim is as follows: l. In a typewriter, the combination with a vibratory carriage, of means for depressing the saine to two positions, said'` means comprising a pair of shift keys fulcrumed coaxially, a depressible arm fulcrumed between and coaxially with the said keys and operatively connected to the vibratdry carringe, a pair of lugs projecting from the arm beneath the respective keys, the said lugs being located at different distances from the fulcrurn point of the bar, and a device for limiting the extent of the depression of the v carriage, substantially as and for the purpose set forth.

2. In a typewriter, the combination with a vibratory carriage, of means for depressing the same to two positions, said means comprising a pair of shift keys fulcrumed coaxially, a deprcssible arm fulcrumed between and coaxially with the said keys and operatively connected to the vibratory carriage, a pair of lugs projecting from the arm beneath the respective keys, the said lu being located at diiierent distances from t e fulcrum point of the arm` a yielding con-` nection between one of the'keys and the said arm whereby the key is returned to its normal raised position independently of the other key, and a device for limiting the extent of the depression of the carriage, substantially as described and for thepurpose 4set forth.

3. In a typewriter, the combination with a-vibratory carriage, of means for depressing v l the same to two positions, said means comprising a pair of fulcrurned shi'r't. keys, a depressible arm fulcrumed between the said '55 keys and operatively connected lto the vibratory carriage, and means adapted to connect the keys attlitferent points respectivelyy to the'said arm and a device for limiting 4the extent of depression of the carriage, sub- ,"o stantially as and for thepurpose s'et forth.

f1 4. In a typewriter, the combination with vibratory carriage, of means for depressing the same to two positions, said means comprising a pair of fulcrumed shift keys, a

depressible arm fulcrumed between the said keys and operatively connected to the vibratory carriage, means adapted to connect the keys at different points respectively to the said arm and a yieldin connection between one of the keys and the vsaid arm .70 whereby the key is returned to its normal raised position independently of the other key and a device for limiting the extent of the depression of the carriage, substantially as and for the purpose set forth.

5. In a typewriter, the combination with. a vibratory carriage,-of a pair of independent keys, means operated by each of such keys for depressing the vibratory carriage, and a movable stop normally out of engagement with 'the said carriage depressing means and operated synchronously with one of the keys tor increasing the extent of the said depression, substantially as described and for the purpose set forth.

6. In a typewriter, the combination with a vibratory carriage, of a pair of independent keys, means operated lby either one of such keys for depressing the vibratory carria e, a bar normally out of engagementgo wit; the vibratory carriage, pivoted at one 'end and having its free end adapted to be swung to and from intersection ofthe vertical plane of the vibratory carriage whlle being depressed, and means operatively connectmg one ofthe keys to t e bar for the purpose of increasing the extent of the'aaid depression, substantially as and. for the purpose set forth. l I g 7. In aI typewriter, the combination with a 'vibratory carriage, of a air of independentV keys, means operated Iby either. one of such keys 'for depressing'the vibratory carriage, a bar pivoted at one end to a. fixed part "and havmg its free end adapted to be Y swung to and from intersection of the path of the vibratory 'carriage while being depressed, a yielding connection between the frame of the machine and the said bar, and means operatively connectingv one lof thev keys to the bar for the urpose of increasing the extent of t-he sald depression, substantially as described 'and for the purpose set forth. I. g

8, In -a typewriter, the combination with 'a vibratory carriage,l having a channel bar e,-of a pair of keys a and t, rocker shaft u, arm lv lugs V7 and 8, universal joint y, arm a, rocker shaft 3, double lever 4, trundlgs/roll f, adjustable stop 6, bar 28, sta'xi'dard 12o 3G, adjustable abutment 31, depending arm l 32, and rigid link 33, substantially as -described and for the purpose Vset forth.

'9. In a typewriting machine, the combi-- nation with a vibratory carriage, and aV bal- 125 ance spring yieldingly supporting such vibratory carriage,-of a air of leversp a lever arm .coact-ing with t e said levers, intermediate mechanism onnecting the said lever arm tc the vibratory carriage, vand a 13o rfetractile spring connectingthe said lever arm t one of the said levers for yieldingly maintaining such1 lever in its normal position', substantially as and for the purpose set forth. y l

10. ln a typewriter, the combination with a vibratory carriage having a channel bar e, of a pairof keys s and t, rocker vshaft n, arm fv, lugs 7 and 8, universal joint y, arm

a, rocker shaft 3, double lever 4, trundle roll' j', stop, bar 28, standard 3 0, abutment 31, depending arm 32 and rigid link 33, substantially as described and for the purpose set forth. y

11. In a typewriter, the combination with 'means operated. by such keys for depressing the vibrato-ry cari-lage, a movable stop for increasing the depression of the vibratory carriage under the influence of one of the keys, a spring connecting the movable stop with the frame of the machine and adapted to return the stop and key to their normal positions, and meansI for locking the keys newness vin their depressed position including a double sto-p, a slidable locking member and a key adapted to move such lockingimember into engagement with'feither one 'fof' the said stops, a downwardly extendingarm upon the other key, and a spring connecting the depending yarm to the lockingmember :for the'purpose of yieldingly maintaining such key in its normal position, substantially as described and for the purpose set forth.

13. A shift lock comprising in "combination a shift shaft, a pair of depressible keys upon such shift shaft', an arm also .upon the shift shaft, and adapted to be depressed by either ofthe said keys, a pair of vertically disposed stops carried by the arm, a slidable plate, a spring connected'to its opposite end to the plate and to a stationary part, and a key adapted to move the slidableplate against the influence of the spring into engagement with either one of the said vertically disposed stops, substantially as dej,

scribed and Jfor the purpose set forth.,`

14. A shift lock comprising in combina'J tion the bar 10, spring 12, lock-bolt 9, with',

shoulders 18, 19, and head 20, lever arinr, and annular lever 24., substantially as described. s. Y

In testimony whereof, I have signedl my name totlfis specication, in the' presence of two subscribing witnesses.

' Grosse winni/in Davis.

Witnesses:

ST1-mimi C. KING, FRED J. SEARS.

Genies of this patent may be obtained for ve cents each, by addressing the Gommssioner-Q Patents@ Washington, D. C. 

